100911-93-1 2-(4-Guanidinobutyl)-2-thiopseudourea dihydrobromide Carbamimidothioic acid, 4-((aminoiminomethyl)amino)butyl ester, dihydrobromide Pseudourea, 2-(4-guanidinobutyl)-2-thio-, dihydrobromide S,4-Guanidinobutylisothiuronium bromide hydrobromide